Change of policy?

I had a full version if this app on my iPhone 4. Now this "free" iphone6 version requires upgrading to a subscription. Liked the app but not happy about this switch. Also, have never been able to figure out how it calculates feet and distance. It doesnt at all relate to whats on treadmill screen.

nacinla about Ease into 5K: run walk interval training program, v3.5.7